Simple Exhaust Questions

[vex]

Thanks Classic. I have a few more questions and desire some more opinions. This is my first Custom exhaust project.

Originally Posted by classicauto

You don't *need* that piece to be SS. Your turbine housing isn't SS anyways. The SS Vbands you'll use after the adaptor will all fit together fine.

Rojer that. I was looking at it the prices of everything and from ATP the V-band SS flanges are about $20 each. So if I were to make V-Band connections for the entire 3" sections I would need $100 worth. I was thinking of just using the adapter and 1 V-band at the turbo as per your following suggestion. Out of curiosity however how much does it cost to get a flange surface ground and where can it be done?

I'd highly recommend avoiding that. You want an easy to remove connection at the back of the turbo.



Whether you use the SS flange by Mazdatrix, or make your own, you can be certain either one will need to be surface ground afterwards. Mild will not be as easily warped.

So I really should go with Mild steel on the engine to header flange then. While I was pricing everything out I came up with a total price for all the flanges to be $242 from ATP and MazdaTrix. This includes:

1. Down Pipe flange (V-Band) Stainless Steel
2. 4 3" Stainless Steel 2-bolt Flanges (For the Pre-Silencer)
3. 4 2.5" Non-Stainless 2-bolt Flanges

To me that seems quite expensive. I'm pretty sure I could just design them up and shoot them out to be Cut for cheaper than picking them up individually like that over the shelf. I think I'll do that and get a quote, depending on what you tell me about grounding I may just do that and design them all, not to mention I could then get stainless steel and not really worry about the shipping.

More mufflers will always be quieter. Offset inlet/outlet will kil alot of noise.

3" single exhaust is NOT quiet.

I don't think the mufflers they offer in racing beat are offset. I'll check Summit and see if I can't find a less expensive SS one that is Offset.

[classicauto]

Originally Posted by vex

Out of curiosity however how much does it cost to get a flange surface ground and where can it be done?

Cost will vary but any machine shop can easily do it. When I needed to have the flange on my Greddy log manifold surface ground it cost me $40 at a local place.

Originally Posted by vex

So I really should go with Mild steel on the engine to header flange then. While I was pricing everything out I came up with a total price for all the flanges to be $242 from ATP and MazdaTrix. This includes:

1. Down Pipe flange (V-Band) Stainless Steel
2. 4 3" Stainless Steel 2-bolt Flanges (For the Pre-Silencer)
3. 4 2.5" Non-Stainless 2-bolt Flanges

To me that seems quite expensive. I'm pretty sure I could just design them up and shoot them out to be Cut for cheaper than picking them up individually like that over the shelf. I think I'll do that and get a quote, depending on what you tell me about grounding I may just do that and design them all, not to mention I could then get stainless steel and not really worry about the shipping.

Yeah if you can have them made cheaper just get them cut. Main reason I go to ATP is because when I'm doing a project like this, I'll just order everything I need since they have it all. Its just easier for me, but just do whatever's easiest/cheapest for you. If I could have that stuff made real local I would......

Originally Posted by vex

I don't think the mufflers they offer in racing beat are offset. I'll check Summit and see if I can't find a less expensive SS one that is Offset.

Yeah summit will have CHEAP mufflers. And don't sweat offset entry/exit killing flow. You should be able to see straight through if you hold the muffler up, but as I'm sure you can envision, sound get cancelled from bouncing around inside them vs. shooting through a tube.

[vex]

Originally Posted by classicauto

Cost will vary but any machine shop can easily do it. When I needed to have the flange on my Greddy log manifold surface ground it cost me $40 at a local place.




Yeah if you can have them made cheaper just get them cut. Main reason I go to ATP is because when I'm doing a project like this, I'll just order everything I need since they have it all. Its just easier for me, but just do whatever's easiest/cheapest for you. If I could have that stuff made real local I would......




Yeah summit will have CHEAP mufflers. And don't sweat offset entry/exit killing flow. You should be able to see straight through if you hold the muffler up, but as I'm sure you can envision, sound get cancelled from bouncing around inside them vs. shooting through a tube.

Cheap as in quality, or cheap as in cost? I found some 304 stainless one's that are offset for about 76 each. Not a good buy? I think they're magnaflow.

[classicauto]

Originally Posted by vex

Cheap as in quality, or cheap as in cost? I found some 304 stainless one's that are offset for about 76 each. Not a good buy? I think they're magnaflow.

EDIT cheap as in cost. Nothing wrong with a stainless packed magnaflow. I ran one for about 3 years before I changed my entire setup.

The spreadsheets look good? Just depends on what you want to run I guess. I should mention, that I'm using vbands for all my connections (at the turbo, bottom of down pipe and back of midpipe/cat section) but they are difficult to get to seal 100%. There's no "exhaust leak" noise from mine, but if you remove the clamps you can see where a little gas has escaped around 2-3% of the v-band

[vex]

Originally Posted by classicauto

EDIT cheap as in cost. Nothing wrong with a stainless packed magnaflow. I ran one for about 3 years before I changed my entire setup.

The spreadsheets look good? Just depends on what you want to run I guess. I should mention, that I'm using vbands for all my connections (at the turbo, bottom of down pipe and back of midpipe/cat section) but they are difficult to get to seal 100%. There's no "exhaust leak" noise from mine, but if you remove the clamps you can see where a little gas has escaped around 2-3% of the v-band

Do you see that same thing with the V-Band connection by the turbo and is this a normal occurrence with V-Band connections? I thought they were better all the way around in sealing off the exhaust and what not?